As displayed in Figure REF , the post-hoc t-tests showed that the participants' understanding was significantly better in the Alterfactual condition compared to all other conditions. The effect size d is calculated according to [1]}Interpretation of the effect size is: d \(<\)  .5 : small effect; d = 0.5-0.8 : medium effect; d \(>\)  0.8 : large effect:
